8 -22 September 1969 - With Canadian icebreaker MacDonald, escorted tanker Manhattan from Resolute, AK to Prudhoe Bay as part of a transit of Northwest Passage. This was the first passage by a commercial ship.

23 June-28 September 1970 - Arctic Operations, including laying cables, oceanographic studies, and re-supplying the DEW (Distance Early Warning) Line. On the 13 July, rescued two from ditched helicopter in Norton Sound near the Yukon.